before fche young are 'bom ajid is kept there until the young are weaned, 

 The-mice and rats are suitable for laboratory use v;hen they are 6 weeks 

 old. , 



■ ■'■ ~ CAGES- . . ,. 



Experiments ^^dth both wooden and metal cages have shown that, other 

 conditions being equal, better results will be obtained in a large colony 

 of white mice or rats by using wooden cages* ■ The cages should be about 

 16 inches long, 14 inches -i^ide. and 10 inches high, inside measurements. 

 The front, back, and bottom should be made of galvanized- v/i re netting of 

 l/4-inch-souare nt^n, and the bottom should be so constructed that a dry 

 pan can be placed underneath. Clean straw or shavings provide go:)d bed- 

 ding. Excelsior ir;ak:es good nesting material. 



White mice and rats thrive best in a temperature of about 65° T-, 



-,-:■.•...•■ ■ ?>En;EErJCES , ■ . 



More complete information on raising white mice and rats is con- 

 tained -in "Breeding and Care of the Albino Eat for Research Purposes, " 

 by Milton «J, G-reerjnan and E, Louise Dehring, published by the Wistar 

 Institute of Anatomy and Biology, Philadelphia, Pa.; and in "Pets for 

 Pleasure and Profit," by. A. Hyatt Verrill, published by Charles Scribner's 

 Sons, iJew York, iJ, Y, 



